Free-wheeling-resistant rolls for mining roof support and the combination of a mining machine and such rolls

ABSTRACT

A roll of grid material for mine roof support, and a mining machine in combination with such a roll, in which the roll has bands of adhering material injected or otherwise forced into the roll in spaced locations along the roll&#39;s width. The adhering material interconnects the overlapped layers within the roll and is sufficiently strong to hold the grid material in the rolled configuration for transport and storage, and yet is readily pulled apart in response to sufficient manual or mechanical pressure applied against the roll, or tension applied to the unwound portion thereof, so as to enable the grid material to be incrementally unwound and installed in the mine. The rolls can be installed using a range of mining machines without need for any specialized dispensing or other apparatus mounted on the machine and without the need for any mechanical device to control unwinding.

This application is a continuation of co-pending application Ser. No.13/435,421, filed Mar. 30, 2012, which claimed the priority of U.S.Provisional application Ser. No. 61/552,874, filed Oct. 28, 2011, thepriority of which is hereby claimed.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is related to the field of mining and, moreparticularly, to rolls of polymeric mesh or grid material for support ofmining tunnels, which rolls are self-resistant to unrolling, a method ofmaking such rolls, and a method of using and installing the sameincluding installation of the rolls with a mining machine.

2. Description of the Related Art

Mining practices have long included the use of a continuous miner havingintegrated roof bolters to support the ceiling or roof of a mine tunnelboth during and after a cutting operation. In addition, supplementalroof supports in the form of continuous lengths or sheets of metallicmesh or wire grids have been installed on the mine tunnel roof. Whilethe roof bolts provide the workers with their primary protection, themesh mats or grids are used to support loose strata and thereby providesecondary protection against material that may fall between the roofbolts.

Installation of the supplemental roof support meshes or grids may beperformed manually, either while the continuous miner is in place orafter the continuous miner has been withdrawn from the tunnel that is tobe supported. Meshing mine tunnels with welded metal wire or mesh matshas always been a very time consuming and dangerous task as they areheavy to manipulate and, when damaged, can inflict puncture injuries onthe installers.

The elimination of wire meshes or mats in favor of rolled polymeric meshmaterials represented an improvement for workers in the mining industryas the polymeric mesh materials enable the mine roof to be meshedwithout the need to handle wire panels. In addition, mechanized methodsof meshing the roof further ease the burden on mine workers.

Many systems have been developed that allow polymeric mesh rolls to beheld and controlled by attaching a deployment apparatus to thecontinuous miner or other mining machine. One such system is disclosedin U.S. Pat. No. 5,816,750 (“the '750 patent”), which is commonly ownedby the assignee of the present application and is hereby expresslyincorporated by reference as if fully set forth herein.

The '750 patent discloses a grid layout system including a griddispenser for rolls of polymeric mesh or grid material. The griddispenser is mounted on the boom of the continuous miner and, inresponse to tension on the roll created by forward and rearward movementof the continuous miner during a cutting operation, incrementallydispenses or retracts the polymeric mesh or grid material above thecontinuous miner which is then bolted to the mine tunnel roof. Toprevent the roll from unwinding when the continuous miner stops, thegrid dispenser of the '750 patent is provided with a motor that exerts aretractive force on the roll which holds the mesh material under tensionin the dispenser.

As noted, the grid layout system disclosed in the '750 patent requires agrid dispenser attached to the mining machine, such that the machinemust be modified to include the dispenser. Therefore, a need exists fora method of deploying and controlling the unrolling of mesh rolls duringinstallation of such rolls for mining roof support that does not requirea special deployment device attached to the mining machine but which canuse the mining machine's existing structure to hold the roll. A needalso exists for a method of deploying mesh rolls that can accommodatenot only horizontal orientations, but vertical and diagonal orientationsas found on mine walls or other surfaces.

SUMMARY OF THE INVENTION

In view of the foregoing, the present invention is directed to themeshing of mine roofs with continuous lengths or sheets of polymericgrid material. The grid material is wound into rolls of overlappinglayers and unwound during installation on mining tunnel ceilings toprovide roof support. In this application, “ceiling” and “roof” are usedinterchangeably and can include the tunnel side walls as well as theceiling or roof.

To prevent free-wheeling of the rolls before and during the installationprocess, the rolls are secured in the rolled configuration by anadhering material that interconnects the overlapped layers within theroll. The adhering material is sufficiently strong to hold the gridmaterial in the rolled configuration for transport and storage, and yetis readily pulled apart in response to sufficient manual or mechanicalforce applied against the roll so as to enable the grid material to beincrementally unwound and installed in the mine. Alternatively, if theroll is held in place, such as by a rod down its center, the force canbe in the form of tension applied to the unwinding portion of the roll,such as by pulling. Hereinafter, the terms “mesh” and “grid material”are used interchangeably and are intended to refer to polymericmaterials.

The present invention is also directed to polymeric mesh rolls securedin the rolled configuration by an adhering material and used for mineroof support, in combination with a mining machine that is used toinstall the rolls. The mining machine does not require any particularstructure or device to hold and dispense the roll so that a wide varietyof mining machines may be used in combination with thefree-wheeling-resistant rolls.

Accordingly, one object of the present invention is to simplify theequipment needed to apply mesh or grid material to mine tunnel roofs.

Another object of the present invention is to provide polymeric meshrolls for mining roof support that are constructed to be, in themselves,resistant to unrolling.

A further object of the present invention is to provide polymeric meshrolls for mining roof support in accordance with the preceding objectsin which the rolls are provided with an adhering material havingsufficient strength to hold a stationary roll in the rolledconfiguration and prevent free-wheeling thereof but that, when subjectedto an unwinding force, may be torn apart so as to allow the roll toreadily unwind as part of the mesh installing operation.

Yet another object of the present invention is to provide polymeric meshrolls for mining roof support in accordance with the preceding objectsin which the rolls are formed from a length of polymeric mesh materialand in which the adhering material may be applied either before, while,or after the mesh is rolled up into the rolled configuration.

Still another object of the present invention is to provide polymericmesh rolls for mining roof support in accordance with the precedingobjects that do not require any special dispensing structure but may beeffectively supported on and dispensed from many different types ofmining machines using the machine's existing drill rods/steels and/orsuper-structure to hold the roll in place during installation.

Yet a further object of the present invention is to provide polymericmesh rolls for mining roof support in accordance with the precedingobjects that can be mounted in any orientation including, but notlimited to, horizontally, vertically or diagonally.

Another object of the present invention is to provide polymeric meshrolls for mining roof support in accordance with the preceding objectsin which the adhering material may be selected to provide for adjustableresistance to unrolling by varying the type of adhering material and/orthe amount of adhering material placed on the rolls.

A further object of the present invention is to provide polymeric meshrolls for mining roof support in accordance with the preceding objectsin which the adhering material is a foam or adhesive material.

A still further object of the present invention is to provide polymericmesh rolls for mining roof support in accordance with the precedingobjects in combination with a mining machine for installing the rolls inwhich the mining machine does not require any specialized structure forsupport of the rolls during installation thereof.

Another object of the present invention is to provide a method ofinstalling polymeric mesh rolls that are self-resistant to unrollingonto a mine roof or ceiling, the method including incrementallyunwinding the mesh roll by applying manual or mechanical force on theroll to unwind a portion of the roll while the remainder of the rollremains intact due to its self-resistance to unrolling.

Yet another object of the present invention is to provide a method ofinstalling polymeric mesh rolls that are self-resistant to unrollingonto a mine roof or ceiling as set forth in the preceding object, inwhich mechanical force for unwinding the roll is applied to the roll bymovement of a mining machine upon which the roll is supported.

A further object of the present invention is to provide a method ofpreventing polymeric mesh rolls from free-wheeling before and duringinstallation on a mine roof by applying an adhering material to therolls having sufficient strength to hold the rolls in a woundconfiguration and prevent the rolls from unwinding due to their ownphysical properties.

Yet a further object of the present invention is to provide a method ofpreventing polymeric mesh rolls from free-wheeling in accordance withthe preceding object in which the adhering material is a foam that ispulled apart when sufficient unwinding force is applied to the outerlayer or free end of the roll to provide for incremental unwinding ofthe roll.

Still another object of the present invention is to provide a method ofmaking a polymeric mesh roll that is self-resistant to free-wheelingboth before and during installation of the mesh material on a mine roof,by applying an adhering material to the mesh material before or as themesh material is wound into a rolled configuration, or by injecting anadhering material into the polymeric mesh roll after the roll has beenwound.

It is yet another object of the invention to provide polymeric meshrolls for mining roof support in accordance with the preceding objectsthat are not complex in structure and which can be manufactured at lowcost but yet can be readily unrolled at a controlled rate for easy, safeand effective installation.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a photograph of a polymeric mesh roll held in the rolledconfiguration by an adhering material in accordance with the presentinvention.

FIG. 2 is a close-up photograph of a portion of the polymeric mesh rollshown in FIG. 1 that includes a band of the adhering material.

FIG. 3 is a photograph taken from the end of the roll shown in FIG. 1and through the center of the roll where the adhering material can beseen to have penetrated therein.

FIG. 4 is a photograph of the polymeric mesh roll shown in FIG. 1 in apartially unrolled and suspended configuration, illustrating thestrength of the adhering material to resist further unrolling whensubjected to the weight of the roll.

FIG. 5 is a photograph of a polymeric mesh roll held in the rolledconfiguration by an adhering material in a test installation on the roofof a mine using a mining machine in accordance with the presentinvention.

FIG. 6 is a close-up photograph showing a side view of the polymericmesh roll of FIG. 5 during the test installation, with the unrolledportion of the roll being supported above the mining machine andadjacent the mine tunnel roof by a channel strap that extends betweentwo lifting jacks of the mining machine.

FIG. 7 is a close-up photograph of the polymeric mesh roll shown inFIGS. 5 and 6 during the test installation, with the unrolled portion ofthe roll being supported by a channel strap and held against the mineroof ready to be installed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In describing a preferred embodiment of the invention illustrated in thedrawings, specific terminology will be resorted to for the sake ofclarity. However, the invention is not intended to be limited to thespecific terms so selected, and it is to be understood that eachspecific term includes all technical equivalents which operate in asimilar manner to accomplish a similar purpose.

The present invention is involved with mining systems such as thatdescribed in the '750 patent in which polymeric mesh or grid material issecured to the ceiling of a mine passageway by roof bolts. Furtherdescription of such a representative mining system is provided in the'750 patent and therefore will not be further described herein.

As shown in FIG. 1, the present invention is directed to a mesh rollgenerally designated by reference numeral 10. The roll includes a lengthof polymeric mesh or grid material 12, preferably uniaxially, biaxiallyor triaxially oriented integral geogrids of the type which arecommercially available from The Tensar Corporation of Atlanta, Ga.(“Tensar”).

According to the invention, a length of mesh 12 is rolled up and held inthe rolled configuration by an adhering material 14. The adheringmaterial 14 secures adjacent layers or laps of the mesh 12 to oneanother so that the roll 10 is self-resistant to unrolling.

As shown in FIGS. 2 and 3, the adhering material 14 penetrates towardand even into the center, generally designated by reference numeral 16,of the roll 10 so that virtually all of the layers of mesh 12 whichoverlap with one another as a result of the rolling process are securedto one another. The adhering material 14 has sufficient strength to holda stationary roll 10 in the rolled configuration without other means ofholding the roll intact and prevent free-wheeling and/or unwinding ofthe roll due to the inherent physical properties of the roll and thematerial from which it is made, such as the material weight, stiffness,springiness, etc.

Preferably, the adhering material is at least strong enough to resistunrolling when subjected to the weight and other physical properties ofthe roll itself, as shown in FIG. 4 by the roll 10 being held above theground by its unwound leading end 18, as well as in FIGS. 5-7 during atest installation of a roll of polymeric mesh material. The degree ofadhesive strength required may differ according to the mesh materialbeing used, being more or less for rolls of the same weight when suchrolls are constructed of various mesh materials having different gridcompositions, grid size, thickness, etc., all of which can contribute tothe rolls' overall stiffness or inherent resistance to being wound intoa roll. However, a strength less than that required to resist unrollingdue to the roll's weight could be used in certain installationoperations such as when the roll is supported on a surface, such as amining machine, so that the free edge is not subjected to the roll'sweight. With the desired degree of strength, the roll 10 can be unrolledin a controlled manner, with the adhering material 14 that holds eachlayer or lap of the mesh 12 to the roll breaking free under sufficienttension and in an incremental manner, as occurs during installation ofthe mesh. At the same time, the remainder of the roll, not yet underinstallation tension, remains intact as a roll.

The present invention is further directed to making mesh rolls that areself-resistant to unwinding. To form a roll 10 according to the presentinvention, a length of polymeric mesh material 12 may be first woundinto a roll after which, when in the rolled configuration, the adheringmaterial 14 is applied, injected or otherwise impressed through the meshopenings 20 and inwardly into the roll interior (see FIGS. 2 and 4).

Alternatively, the adhering material 14 may be applied to a length ofmesh 12 just before and/or as it is being wound into a rolledconfiguration at the manufacturing plant where the rolls are made. Theadhering material 14 may be sprayed, injected, rolled or otherwiseapplied by any application technique suitable for the material beingapplied as would be understood by persons of skill in the art.

The adhering material 14 is preferably a foam or other type of adhesivematerial. One embodiment of the adhering material for the presentinvention is a product known as TOUCH N' SEAL® polyurethane mine foam,manufactured by Convenience Products of Fenton, Mo. The productdescription and technical data describing the TOUCH N' SEAL® mine foamproduct is available at www.touch-n-seal.com. Another foam product thatcould be used according to the present invention is Fomo Foampolyurethane spray foam, manufactured by Commercial Thermal Solutions,Inc. of Spring Lake, N.J.; details on the Fomo Foam product areavailable at www.fomofoam.com. Other foam products having comparablecomposition and adhering capabilities could also be used, as couldvarious adhesive products, as would be understood by persons of ordinaryskill in the art.

The TOUCH N' SEAL® mine foam product provides the desired adheringcapability and is also flame-retardant which is important forunderground use when combustion regulations must be followed. In miningsituations in which flame-retardant materials are not required, such asin hard rock environments, then non-flame-retardant adhering materialscould be used.

Preferably, the foam adhering material is injected through the nozzle ofan applicator gun such as that shown at www.touch-n-seal.com or as partof the Fomo Foam insulation kit shown at www.fomofoam.com. Wheninjecting the foam, the operator typically varies the amount of pressureduring the foaming process, starting with more pressure in order toinject the foam into the center 16 of the roll 10 and then applying lesspressure as the nozzle is drawn away from the center to the outside ofthe roll.

The amount of foam or adhesive adhering material 14 needed is dependentupon the roll's physical properties and the length of the roll 10. Aswould be understood by those skilled in the art, less adhering materialis needed for smaller rolls or rolls made of a relatively flexiblematerial that is readily wound, while a larger volume of adheringmaterial must be used for larger, heavier rolls and rolls made of astiffer material. The type of adhering material may also be varieddepending upon the size and physical properties of the particular rolls,where a weaker adhesive may be sufficient for smaller rolls and/or rollsof fairly flexible material while a stronger adhesive is needed forlarger rolls and/or rolls made of a material more resistant to beingwound. A sufficient volume of adhering material and/or an adheringmaterial of the necessary strength will preferably be at least thatamount and/or type of material that provides enough resistance tounwinding of the roll so that a given roll's unwound weight will notcause the roll to unwind when the roll is lifted by the free end 18 ofthe rolled material (see FIG. 4).

To achieve the needed resistance to unrolling, the adhering material 14may be applied in a plurality of bands 22 spaced from one another alongthe width of the roll. In the roll shown in FIG. 1, two such bands 22have been applied. However, in most mining applications, the rolls arelarger, being on the order of between about 6 feet and about 17 feet inwidth, and of varying lengths. A roll that is 13.12 feet in width and 90feet in length will, of course, require less adhering material than aroll that is the same width and grid material but 180 feet in length,due to the increased weight of the longer roll.

According to one embodiment, multiple bands 22 of adhering materialapproximately 2.5 inches to 3 inches in width are injected into the rollaround the entire circumference thereof in spaced locations along theroll's width. Preferably, there are four such bands in a roll that is 13feet wide, one at each edge of the roll and one spaced from each rolledge about 4.5 feet. However, the arrangement of the bands and theirnumber may be varied provided the total amount of adhering material issufficient to prevent the roll from unwinding under its own weight, incombination with other physical properties, when suspended from anunwound portion of the roll as shown in FIG. 4.

Because the polymeric mesh rolls according to the present invention areself-resistant to unrolling through the retaining force of the adheringmaterial, the rolls do not require any special dispensing structure whenbeing installed using a mining machine. On the contrary, the mesh rollsmay be effectively supported on and dispensed from many different typesof mining machines using the machine's existing drill rods/steels and/orsuper-structure to hold the roll in place during unrolling as shown inFIGS. 5-7.

FIG. 5 is a photograph of a polymeric mesh roll in accordance with thepresent invention with a length 26 of the roll following a leading edge(not shown in FIG. 5) thereof being unwound, extended above the miningmachine 30 and secured to the ceiling of the mine by roof bolts 32. FIG.6 is a closer view of the roll installation set-up shown in FIG. 5,showing the unrolled portion 34 of the roll 10 supported by a channelstrap 36 that extends between two lifting jacks 38 at the front end ofthe mining machine 30.

FIG. 7 is a close-up photograph of the polymeric mesh roll shown inFIGS. 5 and 6 and held against the mining machine's raised drill rod 40.The drill rod is used to drill holes for the roof bolts that will serveto support the mine tunnel roof and secure the mesh material thereto.The raised drill rod/steel 40 holds the unrolled portion 34 of the roll10 in place during installation. As the mining machine 30 moves forward(to the left in FIG. 6), the roll is rotated against the raised drillrod/steel and pushed thereby, pulling the adhering material 14 apart onthe outer portion of the roll and allowing a length 26 of the roll to beunwound as the machine continues to move forward.

As an alternative to mechanically controlling the unwinding processusing movement of the mining machine as just described, the machineoperator can control the amount of the roll to be deployed by manuallypushing or pulling against the roll. For example, the machine operatoror other installer can use a rod and hook bar to latch onto the rolland, by applying force to break the bond between the adhering materialand each lap of mesh, unroll what is needed prior to machineadvancement.

When the rolls are being installed using different machines, or forvertical applications, the roll 10 may be held in place by inserting arod (not shown) through the center of the roll around which the roll maybe unwound. Similarly, if the mining machine does not have a drillrod/steel, a rod (not shown) may be positioned in various locations onthe machine to secure the roll and allow rotation to unwind the roll.

To start installation of a roll, approximately one foot of mesh materialat the roll's leading edge is stripped from the roll to create a leader(see the free end 18 in FIG. 4). The leader is then bolted to the mineroof. The unwound portion 34 of the roll 10 is then located on theadvancing side of the machine's raised roof drill rod 40 as shown inFIGS. 5 and 7. Just prior to advancement of the machine, the drill rodis located to permit the roll material to pass between the top of therod and the mine ceiling. The amount of space between the drill rod topand the mine ceiling must not be too great or the roll may have room tosqueeze between the drill rod and the ceiling. When properly positioned,the machine 30 is then advanced to deploy the roll; alternatively, theoperator pulls the desired length of the mesh material loose from theroll. As the mesh material is unwound, the deployed length 26 of theroll is secured to the roof using roof bolts 32 or other appropriatefasteners as would be known in the art.

The mesh rolls according to the present invention can be mounted in anyorientation including, but not limited to, horizontally, vertically ordiagonally. For example, the installation method as described herein maybe used to secure the polymeric mesh material to the side walls of themine via vertically located rolls (not shown) positioned on each side ofthe continuous miner or roof bolter. For vertical installations, alocation/roll securing rod is needed to hold the roll in place on themachine.

As described herein, the present invention further provides a method forinstalling mesh rolls that does not require a specialized dispenser orother equipment mounted to the mining equipment. The polymeric meshrolls are held in a rolled configuration by adhering material that canbe adjusted in terms of both type and amount to provide the necessaryresistance to unrolling for a particular mining installation and rollsize. The method includes incrementally unwinding the mesh roll byapplying manual or mechanical force on the roll to unwind a portion ofthe roll. Mechanical force for unwinding the roll may be applied to theroll by movement of the mining machine upon which the roll is supported.Since the mesh roll is held in the rolled configuration by the adheringmaterial, the remainder of the roll not yet subject to manual ormechanical force remains intact due to its self-resistance to unrolling.Therefore, the mesh rolls according to the present invention do notrequire any mechanical device to control unwanted unwinding.

The present invention is further directed to polymeric mesh rolls asdescribed herein in combination with a mining machine for installing therolls. Mining machines that can be used to install the mesh rollsinclude, but are not limited to, continuous miner/bolters, roof bolters,jumbos, and other drilling machines. Virtually any type of miningmachine may be used in combination with the free-wheeling resistant meshrolls as described herein because the mining machine does not have to beequipped with any specialized structure for support of the rolls duringinstallation thereof. With the mining machine shown in FIGS. 5-7, thefree end of the roll is secured to the roof of the mine and then theunwound portion of the roll is located on the advancing side of themachine's raised roof drill rod.

An additional benefit of the present invention is that, by providingrolls as described herein, the installer's job is made much easier asthe rolls, which are often 15 feet wide and 200 feet long, need only becarried to the front of the mining machine once, thus eliminating laborintensive material handling as was needed when installing wire panels.

While the present invention has been described in connection withpolymeric mesh rolls, it may be possible to produce free-wheelingresistant rolls for mine support made of wire mesh and held in a rolledconfiguration with a suitable adhesive material. Accordingly, thepresent invention is intended to cover wire mesh rolls held with anadhering material and installed using a mining machine in the mannerdescribed herein with respect to polymeric mesh rolls.

The foregoing descriptions and photographs should be considered asillustrative only of the principles of the invention. The invention maybe configured in a variety of shapes and sizes and is not limited by thedimensions of the preferred embodiment. Numerous applications of thepresent invention will readily occur to those skilled in the art.Therefore, it is not desired to limit the invention to the specificexamples disclosed or the exact construction and operation shown anddescribed. Rather, all suitable modifications and equivalents may beresorted to, falling within the scope of the invention.

1. A method of forming a polymeric mesh roll for mine roof and wallsupport that is self-resistant to unrolling, comprising winding a lengthof polymeric mesh material into a roll of overlapping layers andapplying an adhering material to the mesh material, said adheringmaterial interconnecting the overlapping layers within the roll andhaving sufficient strength to hold the roll in a wound configuration andprevent the roll from free-wheeling or unwinding due to the roll's ownphysical properties.
 2. The method as set forth in claim 1, wherein theadhering material is applied before, as, or after the mesh material iswound.
 3. The method as set forth in claim 1, wherein the adheringmaterial penetrates inwardly toward a center of the roll so thatsubstantially all of the layers that overlap as a result of winding thelength of mesh material are secured to one another.
 4. The method as setforth in claim 3, wherein the adhering material is applied after themesh material has been wound into a roll and the step of applying theadhering material includes injecting the adhering material underpressure into the wound roll using an applicator nozzle that can beinserted into the roll.
 5. The method as set forth in claim 4, whereinthe step of injecting includes applying greater pressure during a firststage to inject the adhering material into a center of said roll, andapplying a lesser pressure as the nozzle is drawn away from the centerto the outside of the roll.
 6. The method as set forth in claim 2,wherein the step of applying the adhering material includes spraying orrolling the adhering material onto the mesh material before, or as, theroll is wound.
 7. The method as set forth in claim 1, wherein the stepof applying the adhering material includes applying said adheringmaterial in a plurality of bands spaced from one another along a widthof the roll.
 8. The method as set forth in claim 1, wherein the step ofapplying the adhering material includes selecting an adhering materialfrom a first adhering material having a first adhering strength and asecond adhering material having a second adhering strength greater thansaid first adhering strength, to form a roll with a lesser or a greaterdegree of resistance to unrolling.
 9. A polymeric mesh roll for mineroof and wall support comprising a continuous length or sheet ofpolymeric mesh material wound into a roll of overlapping layers andsecured in a rolled configuration by an adhering material thatpenetrates toward a center of the roll and interconnects the overlappinglayers within the roll, said roll with said adhering material beingself-resistant to unrolling.
 10. The polymeric mesh roll as set forth inclaim 9, wherein the adhering material is sufficiently strong to preventthe roll from free-wheeling or unwinding due to its own physicalproperties but which is readily pulled apart layer by layer in responseto sufficient manual or mechanical force applied against the roll toincrementally unwind said roll.
 11. The polymeric mesh roll as set forthin claim 10, wherein the adhering material type and/or quantity and thegrid material are selected to obtain a roll that will not unwind underits own weight when the roll is suspended by its free end.
 12. Thepolymeric mesh roll as set forth in claim 9, wherein said adheringmaterial is a foam.
 13. The polymeric mesh roll as set forth in claim 9,wherein said adhering material is an adhesive.
 14. The polymeric meshroll as set forth in claim 9, wherein said adhering material forms aplurality of bands spaced from one another along a width of said roll.15. The polymeric mesh roll as set forth in claim 9, wherein saidpolymeric grid material is an oriented geogrid.
 16. The polymeric meshroll as set forth in claim 9, in combination with a mining machine usedto install the rolls.
 17. (canceled)
 18. (canceled)
 19. A method ofinstalling polymeric mesh rolls onto a mine roof or wall comprising:providing a polymeric mesh roll formed by winding a length of polymericmesh material into a roll and applying an adhering material to the meshmaterial so that overlapping layers of the roll are bonded to oneanother by adhering material bonds that make the roll self-resistant tounwinding; applying manual or mechanical force to an outer part of theroll to separate the adhering material bonds in the outer part andunwind the outer part of the roll while a remaining inner part of saidroll is held intact by remaining adhering material bonds that make theroll self-resistant to unwinding; and fastening said unwound roll outerpart to said mine roof or wall.
 20. (canceled)
 21. (canceled) 22.(canceled)
 23. The method as set forth in claim 19, wherein the step ofapplying force includes pulling on a free end of an outer layer of theroll to break the bond between the outer layer and a layer directlyunder said outer layer to form an unwound portion, and continuing toapply force to said unwound portion to incrementally unwind the roll bybreaking the bond between each subsequent layer and a layer thereundermoving from the outer layer inwardly to a center of the roll.
 24. Themethod as set forth in claim 19, wherein said method includes supportingthe roll on a mining machine used to install the roll and holding saidroll against an outwardly projecting member of said mining machine, saidstep of applying force including applying mechanical force to the rollby movement of the mining machine to unwind a portion of the roll whilethe remainder of said roll remains intact and is held against theoutwardly projecting member.
 25. The combination of a polymeric meshroll self-resistant to unwinding and a mining machine for installing theroll on a mine surface, comprising: a mining machine having an outwardlyprojecting member; and a polymeric mesh roll held against said outwardlyprojecting member, said mesh roll including a continuous length or sheetof polymeric mesh material wound into a roll of overlapping layers andsecured in a rolled configuration by an adhering material thatinterconnects the overlapped layers within the roll so that the roll isself-resistant to unrolling, said roll being rotated against theoutwardly projecting member by movement of the mining machine and pushedthereby so that the adhering material securing two outermost layers ofthe roll is pulled apart, allowing a length of the roll to beincrementally unwound layer by layer as the machine moves, saidoutwardly projecting member holding the unwound length of said roll inplace against the mine surface during installation.
 26. (canceled) 27.(canceled)